Azo-dyestuffs and process of making same



p in Drawing; Appplication filed September 26, 1932,8eria130.634987; and in Switzerland October 12, 1931.

Patented July 25, 1933 j l UNITED STATES PAT "N Tor1=1icr. j

oHEMrcAL INDUSTRY IN BAS AZo-nYEsT rrs AND rnocnss oir MAK'INGSAME: I v

The present invention relates to. new :azo-

' dyestuffs which are. particularly important for dyeing. esters and others of cellulose,

' such as acetate silk. Itco'mprises the new dyestuffs, the process of making and applying same, and the material. dyed with the new dyestuffs.

It has been found that new dyestuffs are obtained by causing the diazo-compound of t-nitro-Q-chloro-l-aminobenzene to act on a Knon-sulfonated mononuclear -primary amine of the benzene series which contains no substituent in. the meta-pos1t1on to the amino-group, and correspond1ngw1th the general formula a H as off the alkyl-o-sulfonic acid group. The dyein s obtained by means of these dyestuffs are c1aracterized by purity and excellent fastness to light and washing. By a suitable selection of the coupling component there maybe obtained dyestuffs which dye acetate silk orange to red-orange. The dye-- stuffs thus obtained are also excellently suited for dyeinglacquers, varnishes, artificial masses etc., produced on the basis of nat'ural resins or artificial products, such as'nitrocellulose, condensation products of sulfur or aldehydes with, respectively, phenols or bases etc. g

The. new] products corresponding to the nor-qlhNg-Nin l z i wherein w stands for hydrogen, alkyl, or

alkoxy, form red powders dissolving in organic solvents, such as acetic acid ethylester, acetone, alcoho1, and the like, to orange to red-orange solutions. They are practically insoluble in water and are therefore FRIEDRICH FELIX, or BASEL, SWITZERLAND, ASSIGNOH TO THE FIRM oF socrE'rY'oF.

LE, or IBASEL, SWITZERLAND p preferably usediina finely subdivided form into which they are brought by grinding hyde or of turpentine oil; Thesepastes may be useddirectly for dyeing or they may be converted into dry preparations which canv be, powdered by cautiously drying them inia vacuumlat a temperature which is not too Gil.

high-"inpresence of a further quantity. of c the said "dispersing agent or another, such .as sulfite cellulose liquon' r The following example illustrates the inventi'on, the partsbeing by weight The solution obtained in the usual manher from 172 parts of 4-nitro-2-chloro-1- aminobenzene is introduced into a cold solu--' tion of 209 parts of the sodium salt of aniline-w-methanesulfonic. acid. When the formation of dyestuf'f is at an end, the whole;

; is filtered and the dyestufl heated cautiously with 1502()0 parts of caustic soda. liquor. of

30per cent. strength until the methanesulfonic acid has been completely split off. Filtration and washing follow.

--The dry dyestuff which corresponds with the formula is an orange red powder which dissolves in organic solvents, like alcoholor ethyl ace- The operations are similar for the manufacture of dyestuffs from 4-nitro-2-chloraniline and ortho-toluidine or ortho-anisidine or 'orthmphenetidine, appreciably redder dyeing products being, however,"

obtained. i

What I claim is 1. Process for the manufacture of new combining the 'diazo compound'of the 4-nitro-2-chloro-1- azo-dyestufls, consisting in aminobenzene with an alkyl-m-sulfonic acid of a primary amine of the general formula wherein ac stands for hydrogen, alkyl or alkoxy, and splitting Ofi the alkyl-o-sulfonic acid group in the dyestuffs thus obtained by treatment with saponifying agents.

2. Process for the manufacture of new azo-dyestuiis, consisting in combining the diazo compound of the A-nitro-Q-chloro-laminobenzene with an w-lllBthttllGSHlfOfiiC acid of a primary amine of the general formula H a: l l

wherein m stands for hydrogen, alkyl or alkoxy, and splitting of? the o-methanesulfonic acid group in the dyestuffs thus-obtained by treatment with saponiiying agents.

3. Process for the manufacture of new wherein :0 stands for hydrogen, alkyl or allroxy, which products form red powders dissolving in acetic ester to orange-red to red-orange solutions, and dyeing acetate silk from fine aqueous suspensions fast orange tints. v

5. The product of the formula which product forms a red powder which dissolves in acetic ester to an orange-red solution, and dyeing acetate silk from a fine aqueous suspension fast orange tints.-

FRIEDRICH FELIX. 

